A stochastic empirical model for regional heavy-metal balances in agroecosystems.
作者： A. Keller , B. von Steiger , S.E.A.T.M. van der Zee , R. Schulin
DOI: 10.2134/JEQ2001.1976
关键词:
摘要: Mass flux balancing provides essential information for preventive strategies against heavy-metal accumulation in agricultural soils that may result from atmospheric deposition and application of fertilizers pesticides. In this paper we present the empirical stochastic balance model, PROTERRA-S, estimates phosphorus on regional level. The basic units these balances are land use systems defined by livestock production cultivated crops. model is designed to available databases, such as statistics soil systems. a case study, assessed phosphorus, cadmium, zinc Sundgau region, Switzerland. P requirements crops were mainly supplied animal manure (56%) commercial (40%). Net cadmium fluxes ranged 1.0 g ha (t) yr(-1) (dairy mixed farm types) 17.8 ha(-1) (animal husbandry systems), whereas net was only 1.4 yr(-1). 605 smallest 101 (-1) found an arable type, up 39.8 kg estimated. Comparison results with reported metal experimental farms shows identification high risks benefits stratification according while accounting their fertilization plans. Consequently, support sustainable management cycles soils.
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